Our Nodejs application uses Mongoose for MongoDB. Our application crashes when it unable to connect to MongoDB database. We are using MongoLab.
What are the best ways to handle database connect issue in Node JS application?
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1 Answer
Just handle error with the associated events:
// If the connection throws an error
connection.on('error',function (err) {
// Do something here
});
// When the connection is disconnected
connection.on('disconnected', function () {
// Do something else here
});
And, of course, when running a query, it's very recommended to always check err parameter of the callback function before going any further.
3 Comments
Fizer Khan
Thanks. It works great. But when the connection error, the request waits for response for a long time. Is there any way to timeout? is there any difference between connnection timeout and socket timeout?
Pierre
As far as I know, a socket timeout implies a connection timeout. You can define the connection timeout by passing it as a option when calling
connect : mongoose.connect(url, { server: { socketOptions: { connectTimeoutMS: 1000 }}}, function(err) { ... });Fizer Khan
Thanks. But MongoLab blogs talk about connection timeout and socket timeout separately blog.mongolab.com/2013/10/do-you-want-a-timeout